Theorem scutfo 33676

Description: The surreal cut function is onto. (Contributed by Scott Fenton, 23-Aug-2024.)

Assertion

Ref	Expression
scutfo	⊢ |s : <<s –onto→ No

Proof of Theorem scutfo

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		scutf 33602	. 2 ⊢ |s : <<s ⟶ No
2		lltropt 33647	. . . . 5 ⊢ (𝑥 ∈ No → ( L ‘𝑥) <<s ( R ‘𝑥))
3		df-br 5037	. . . . 5 ⊢ (( L ‘𝑥) <<s ( R ‘𝑥) ↔ ⟨( L ‘𝑥), ( R ‘𝑥)⟩ ∈ <<s )
4	2, 3	sylib 221	. . . 4 ⊢ (𝑥 ∈ No → ⟨( L ‘𝑥), ( R ‘𝑥)⟩ ∈ <<s )
5		lrcut 33675	. . . . 5 ⊢ (𝑥 ∈ No → (( L ‘𝑥) |s ( R ‘𝑥)) = 𝑥)
6	5	eqcomd 2764	. . . 4 ⊢ (𝑥 ∈ No → 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥)))
7		fveq2 6663	. . . . . 6 ⊢ (𝑦 = ⟨( L ‘𝑥), ( R ‘𝑥)⟩ → ( |s ‘𝑦) = ( |s ‘⟨( L ‘𝑥), ( R ‘𝑥)⟩))
8		df-ov 7159	. . . . . 6 ⊢ (( L ‘𝑥) |s ( R ‘𝑥)) = ( |s ‘⟨( L ‘𝑥), ( R ‘𝑥)⟩)
9	7, 8	eqtr4di 2811	. . . . 5 ⊢ (𝑦 = ⟨( L ‘𝑥), ( R ‘𝑥)⟩ → ( |s ‘𝑦) = (( L ‘𝑥) |s ( R ‘𝑥)))
10	9	rspceeqv 3558	. . . 4 ⊢ ((⟨( L ‘𝑥), ( R ‘𝑥)⟩ ∈ <<s ∧ 𝑥 = (( L ‘𝑥) |s ( R ‘𝑥))) → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦))
11	4, 6, 10	syl2anc 587	. . 3 ⊢ (𝑥 ∈ No → ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦))
12	11	rgen 3080	. 2 ⊢ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)
13		dffo3 6865	. 2 ⊢ ( |s : <<s –onto→ No ↔ ( |s : <<s ⟶ No ∧ ∀𝑥 ∈ No ∃𝑦 ∈ <<s 𝑥 = ( |s ‘𝑦)))
14	1, 12, 13	mpbir2an 710	1 ⊢ |s : <<s –onto→ No

Syntax hints:   = wceq 1538   ∈ wcel 2111  ∀wral 3070  ∃wrex 3071  ⟨cop 4531   class class class wbr 5036  ⟶wf 6336  –onto→wfo 6338  ‘cfv 6340  (class class class)co 7156   No csur 33441   <<s csslt 33573   |s cscut 33575   L cleft 33624   R cright 33625

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-rep 5160  ax-sep 5173  ax-nul 5180  ax-pow 5238  ax-pr 5302  ax-un 7465

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-ral 3075  df-rex 3076  df-reu 3077  df-rmo 3078  df-rab 3079  df-v 3411  df-sbc 3699  df-csb 3808  df-dif 3863  df-un 3865  df-in 3867  df-ss 3877  df-pss 3879  df-nul 4228  df-if 4424  df-pw 4499  df-sn 4526  df-pr 4528  df-tp 4530  df-op 4532  df-uni 4802  df-int 4842  df-iun 4888  df-br 5037  df-opab 5099  df-mpt 5117  df-tr 5143  df-id 5434  df-eprel 5439  df-po 5447  df-so 5448  df-fr 5487  df-we 5489  df-xp 5534  df-rel 5535  df-cnv 5536  df-co 5537  df-dm 5538  df-rn 5539  df-res 5540  df-ima 5541  df-pred 6131  df-ord 6177  df-on 6178  df-suc 6180  df-iota 6299  df-fun 6342  df-fn 6343  df-f 6344  df-f1 6345  df-fo 6346  df-f1o 6347  df-fv 6348  df-riota 7114  df-ov 7159  df-oprab 7160  df-mpo 7161  df-wrecs 7963  df-recs 8024  df-1o 8118  df-2o 8119  df-no 33444  df-slt 33445  df-bday 33446  df-sslt 33574  df-scut 33576  df-made 33626  df-old 33627  df-left 33629  df-right 33630

This theorem is referenced by: (None)